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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5288acfa2ff6b7282b0753b1278ce40467ceb6fe6f44c0ee1d7ed2c577492f3d' 
  AND token = 'gT7y49zwmsf+Oim9POvLT105+n4s/8JemfdfYzHgGAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}